647672 has 16 divisors (see below), whose sum is σ = 1278600. Its totient is φ = 306720.

The previous prime is 647663. The next prime is 647687. The reversal of 647672 is 276746.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647672.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979 + ... + 2282.

2⁶⁴⁷⁶⁷² is an apocalyptic number.

It is an amenable number.

647672 is a deficient number, since it is larger than the sum of its proper divisors (630928).

647672 is a wasteful number, since it uses less digits than its factorization.

647672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286 (or 4282 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 647672 is about 804.7807154747. The cubic root of 647672 is about 86.5203712031.

The spelling of 647672 in words is "six hundred forty-seven thousand, six hundred seventy-two".